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Finding the Fourth Proportional to 641,645.40, 961,431.30 and 404,563.80

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Solution

The fourth proportional to 641,645.40, 961,431.30 and 404,563.80 is: 606,191.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,645.40 : 961,431.30 = 404,563.80 : x
  2. Step 2: Convert to fraction form
    641,645.40/961,431.30 = 404,563.80/x
  3. Step 3: Cross multiply
    641,645.40x = 961,431.30 × 404,563.80
  4. Step 4: Simplify right side
    641,645.40x = 388,960,300,166.94
  5. Step 5: Solve for x
    x = 388,960,300,166.94/641,645.40
  6. Step 6: Final answer
    x = 606,191.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.